Commit c745fe61 authored Dec 09, 2013 by Alex Deucher

drm/radeon/dpm: disable ss on Cayman

Spread spectrum seems to cause hangs when dynamic clock
switching is enabled.  Disable it for now. This does not
affect performance or the amount of power saved. Tracked
down by Martin Andersson.

bug:
https://bugs.freedesktop.org/show_bug.cgi?id=69723



Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org

parent 533518a4

drivers/gpu/drm/radeon/rv770_dpm.c

+6 −0

Original line number	Diff line number	Diff line
		@@ -2328,6 +2328,12 @@ void rv770_get_engine_memory_ss(struct radeon_device *rdev)
		pi->mclk_ss = radeon_atombios_get_asic_ss_info(rdev, &ss,
		ASIC_INTERNAL_MEMORY_SS, 0);

		/* disable ss, causes hangs on some cayman boards */
		if (rdev->family == CHIP_CAYMAN) {
		pi->sclk_ss = false;
		pi->mclk_ss = false;
		}

		if (pi->sclk_ss \|\| pi->mclk_ss)
		pi->dynamic_ss = true;
		else